Ruby
ericrisco/rsc-harness
A skill your agent uses when writing or refactoring plain Ruby outside Rails — scripts, CLIs, gems, libraries: Enumerable chains and blocks, module mixins and value objects, Bundler/gemspec…
Write Ruby gems following Andrew Kane's proven patterns and philosophy.
Install Andrew Kane Gem Writer
$ npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Microck/ordinary-claude-skills andrew-kane-gem-writer --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Microck/ordinary-claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills_all/andrew-kane-gem-writer .claude/skills/andrew-kane-gem-writer && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "andrew-kane-gem-writer" agent skill from https://github.com/Microck/ordinary-claude-skills/tree/main/skills_all/andrew-kane-gem-writer into .claude/skills/andrew-kane-gem-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "andrew-kane-gem-writer", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Microck/ordinary-claude-skills/tree/main/skills_all/andrew-kane-gem-writerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Microck/ordinary-claude-skills andrew-kane-gem-writer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Microck/ordinary-claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills_all/andrew-kane-gem-writer .agents/skills/andrew-kane-gem-writer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "andrew-kane-gem-writer" agent skill from https://github.com/Microck/ordinary-claude-skills/tree/main/skills_all/andrew-kane-gem-writer into .agents/skills/andrew-kane-gem-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "andrew-kane-gem-writer", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Microck/ordinary-claude-skills andrew-kane-gem-writer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Microck/ordinary-claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills_all/andrew-kane-gem-writer .cursor/skills/andrew-kane-gem-writer && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "andrew-kane-gem-writer" agent skill from https://github.com/Microck/ordinary-claude-skills/tree/main/skills_all/andrew-kane-gem-writer into .cursor/skills/andrew-kane-gem-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "andrew-kane-gem-writer", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Microck/ordinary-claude-skills.git --path skills_all/andrew-kane-gem-writer--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Microck/ordinary-claude-skills andrew-kane-gem-writer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Microck/ordinary-claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills_all/andrew-kane-gem-writer .gemini/skills/andrew-kane-gem-writer && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "andrew-kane-gem-writer" agent skill from https://github.com/Microck/ordinary-claude-skills/tree/main/skills_all/andrew-kane-gem-writer into .gemini/skills/andrew-kane-gem-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "andrew-kane-gem-writer", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Microck/ordinary-claude-skills andrew-kane-gem-writerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Microck/ordinary-claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills_all/andrew-kane-gem-writer .github/skills/andrew-kane-gem-writer && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "andrew-kane-gem-writer" agent skill from https://github.com/Microck/ordinary-claude-skills/tree/main/skills_all/andrew-kane-gem-writer into .github/skills/andrew-kane-gem-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "andrew-kane-gem-writer", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Microck/ordinary-claude-skills andrew-kane-gem-writer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Microck/ordinary-claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills_all/andrew-kane-gem-writer .opencode/skills/andrew-kane-gem-writer && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "andrew-kane-gem-writer" agent skill from https://github.com/Microck/ordinary-claude-skills/tree/main/skills_all/andrew-kane-gem-writer into .opencode/skills/andrew-kane-gem-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "andrew-kane-gem-writer", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
andrew-kane-gem-writer- GitHub stars
- 404
- Used in
- 2 other repos
- Token cost
- ~1.2k tokens
- SKILL.md length
- 180 words
- Files
- 2
- Skills in repo
- 89
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Write Ruby gems following Andrew Kane's proven patterns and philosophy.
- Creating new Ruby gems
- SKILL.md covers Core Philosophy, Entry Point Structure, Class Macro DSL Pattern and Rails Integration, plus 6 more sections
- Needs GEMNAME_MASTER_KEY
- Refactoring existing gems
What it does
Andrew Kane Gem Writer is an agent skill from Microck/ordinary-claude-skills. Write Ruby gems following Andrew Kane's proven patterns and philosophy. Use when creating new Ruby gems, refactoring existing gems, designing gem APIs, or when the user wants clean, minimal, production-ready Ruby library code. Triggers on requests like "create a gem", "write a Ruby library", "design a gem API", or mentions of Andrew Kane's style.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `metadata.json`).
It sits in Development, covering Refactoring and Backend development. It works with Ruby. The repository describes itself as: An unappealing collection of Claude Skills and resources.
When your agent uses it
- Creating new Ruby gems
- Refactoring existing gems
- Designing gem APIs
- The user wants clean
Example prompts
- “create a gem”
- “write a Ruby library”
- “design a gem API”
- “/andrew-kane-gem-writer”
Requirements
- A credential in GEMNAME_MASTER_KEY
What it can do on your machine
Read from SKILL.md and the folder at commit 1056d29. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are ruby).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
GEMNAME_MASTER_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Andrew Kane Gem Writer loads about 1.2k tokens when it runs. Until then it costs about 93 tokens; SKILL.md has 180 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 180 words (~1,207 tokens).
“Write Ruby gems following Andrew Kane's battle-tested patterns from 100+ gems with 374M+ downloads (Searchkick, PgHero, Chartkick, Strong Migrations, Lockbox, Ahoy, Blazer, Groupdate, Neighbor, Blind Index).”
- name
- andrew-kane-gem-writer
Files
SKILL.md and 1 other file in skills_all/andrew-kane-gem-writer of Microck/ordinary-claude-skills.
- SKILL.md
- metadata.json
Open the folder on GitHubat commit 1056d29
Used in 2 other repositories
We found 3 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in Microck/ordinary-claude-skills, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Andrew Kane Gem Writer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Andrew Kane Gem Writer this skillMicrock/ordinary-claude-skills | 404 | 2 repos | ~1.2k | Automated safety check: Pass | Custom licence | |
| Rubyericrisco/rsc-harness | 180 | — | ~3.2k | Automated safety check: Pass | MIT | |
| Antipattern Preventiondoorkeeper-gem/doorkeeper | 5.5k | — | ~1.1k | Automated safety check: Pass | MIT | |
| Gumroad Prod Consoleantiwork/gumroad | 9.8k | — | ~2.9k | Automated safety check: Notes | MIT | |
| Bootui Java Developmentjdubois/boot-ui | 315 | — | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| Clean Code Refactorerfike/fastapi-blog | 101 | — | ~402 | Automated safety check: Pass | MIT |
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doorkeeper-gem/doorkeeper
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Execute read-only Ruby/Rails commands against Gumroad's production database for debugging and investigation.
Bootui Java Development
jdubois/boot-ui
A skill your agent uses when implementing, debugging, refactoring, or testing existing BootUI Java code, including framework-neutral engine logic, Spring MVC and WebFlux adapters, Quarkus runtime…
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Skill for identifying code smells and refactoring code using Clean Code, SOLID, and DRY principles.
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Related
Works with
Categories
Questions about Andrew Kane Gem Writer
What does Andrew Kane Gem Writer do?
Write Ruby gems following Andrew Kane's proven patterns and philosophy. Andrew Kane Gem Writer is an agent skill from Microck/ordinary-claude-skills. Write Ruby gems following Andrew Kane's proven patterns and philosophy.
When should I use Andrew Kane Gem Writer?
Andrew Kane Gem Writer fits situations like: creating new Ruby gems; refactoring existing gems; designing gem APIs; the user wants clean.
How do I install Andrew Kane Gem Writer in Claude Code?
Run `npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a claude-code`. Or copy the skill folder (skills_all/andrew-kane-gem-writer in Microck/ordinary-claude-skills) into .claude/skills/andrew-kane-gem-writer in your project. Claude Code loads it when a task matches its description.
How do I install Andrew Kane Gem Writer in Codex?
Run `npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a codex`. Or copy the skill folder (skills_all/andrew-kane-gem-writer in Microck/ordinary-claude-skills) into .agents/skills/andrew-kane-gem-writer in your project. Codex loads it when a task matches its description.
Can I use Andrew Kane Gem Writer in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Microck/ordinary-claude-skills --skill andrew-kane-gem-writer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/andrew-kane-gem-writer, .gemini/skills/andrew-kane-gem-writer, .github/skills/andrew-kane-gem-writer and .opencode/skills/andrew-kane-gem-writer in your project.
What does Andrew Kane Gem Writer need to run?
Going by SKILL.md and its folder, Andrew Kane Gem Writer needs credentials named GEMNAME_MASTER_KEY. Our summary lists: A credential in GEMNAME_MASTER_KEY.
Does Andrew Kane Gem Writer access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Andrew Kane Gem Writer safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Andrew Kane Gem Writer use?
Andrew Kane Gem Writer has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Andrew Kane Gem Writer use?
About 1.2k tokens (SKILL.md is roughly 4.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Andrew Kane Gem Writer?
Skills that share tags, products or a category with Andrew Kane Gem Writer: Ruby (ericrisco/rsc-harness, 180 stars), Antipattern Prevention (doorkeeper-gem/doorkeeper, 5.5k stars), Gumroad Prod Console (antiwork/gumroad, 9.8k stars) and Bootui Java Development (jdubois/boot-ui, 315 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Andrew Kane Gem Writer?
Microck (a GitHub user) maintains it in Microck/ordinary-claude-skills, which has 404 GitHub stars. The repository holds 89 skills in this directory. The repository was last updated on September 6, 2026.
Source: Microck/ordinary-claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.